Electromagnetic Induction
Electromagnetic induction is the production of induced current in a conductor when the magnetic field around it changes.
Practice This ConceptMain explanation
Teacher explanation
If the magnetic field linked with a coil changes, an electric current can be produced in the coil. The change may happen by moving a magnet toward or away from the coil, or by moving the coil in a magnetic field. The main idea is change in magnetic flux, not just the presence of a magnet. This principle is used in generators and many induction-based devices.
Example
When a bar magnet is moved into a coil connected to a galvanometer, the needle deflects, showing induced current.
Simple analogy
No change, no induction.
Common confusion
Students often think a magnet alone produces current at rest. Current is induced only when the magnetic field changes.
Exam tip
Use the words change in magnetic field, induced current, and relative motion in exam answers.
Answer writing and exam use
1-mark use
Write the exact meaning of electromagnetic induction in one clean line.
2-mark use
Define electromagnetic induction and add one example or condition.
3-mark use
Explain electromagnetic induction, show the method or example, and mention the common mistake.
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